<!DOCTYPE html>
<html>
<head>
  <style>
  textarea { height:35px; }
  div { color: red; }
  fieldset { margin: 0; padding: 0; border-width: 0; }
  .marked { background-color: yellow; border: 3px red solid; }
</style>
  <script type="text/javascript" src="static/js/jquery/jquery-2.2.4.min.js">
  </script>
</head>
<body>
  <form>
  <fieldset>
    <input type="button" value="Input Button"/>
    <input type="checkbox" />
 
    <input type="file" />
    <input type="hidden" />
    <input type="image" />
 
    <input type="password" />
    <input type="radio" />
    <input type="reset" />
 
    <input type="submit" />
    <input type="text" />
    <select><option>Option<option/></select>
 
    <textarea></textarea>
    <button>Button</button>
  </fieldset>
</form>
 
<div>
</div>
<script>
  //var input = $(":button").addClass("marked");
  var input = $("button, input[type='button']").addClass("marked");
  //var input = $("input[type='button']").addClass("marked");
  $("div").text( "For this type jQuery found " + input.length + "." );
  $("form").submit(function () { return false; }); // so it won't submit
</script>
 
</body>
</html>